I ran into DCV the same way most folks do: I bought a title, assumed I could "make it MP4," then fell down a confusing trap of EME, CDMs, and the "why is this grayed out" blues.
A few tests later—some successful, some… very not—I realized the real game isn’t "trick the file," it’s picking the right workflow for your goal while staying on the right side of the rules. This post is written to help you avoid mistakes I made, and convert DCV or ESDCF files from FANZA to MP4 video files easily and safely.
Quick Lead to What You Need:
Definition Part: DCV, WSDCF, MP4 ➡️ Section 1
"DCV" (and VR-oriented "WSDCF") are proprietary, DRM-controlled formats used in the DMM/FANZA ecosystem. They don’t map 1:1 to MP4.
Read Before Conversion: Legality Explained ➡️ Section 2
In the US, DMCA §1201 generally prohibits circumventing access controls. There are also specific, narrow exemptions.
How to Enjoy FANZA Offline: Step by Step ➡️ Section 3
Recommended Route: Official downloads (where available) → a reliable third-party downloader → screen recording. Each with trade-offs in quality, stability, cost, and risk.
What is DCV or WSDCF?
FANZA is Japan's leading adult portal that provides numerous adult content, including films, games, e-books, and other digital entertainment. Nearly all the content here is original. You can subscribe to an exact channel, buy or rent titles in FANZA.
With the official DMM Player, you can download FANZA videos to watch offline easily on a computer. But the original downloaded files are saved in DCV or WSDCF format, and can only be opened within the DMM Player.
Definition Card
- DCV (and VR-focused WSDCF) are proprietary, DRM-gated formats in the DMM/FANZA ecosystem. Playback is mediated by the platform’s player stack (DMM Player) and license checks. These constraints are by design and are reinforced in web contexts via Encrypted Media Extensions (EME).
- The ".dcv" extension is currently used by Japanese distribution services such as "DMM.TV" and "FANZA. DCV or WSDCF doesn't map 1:1 to MP4.
DCV and MP4 formats are 2 different file formats, with the main differences being usage, security features, and file structure.
DCV Format
- An encrypted container.
- It's often used by encryption tools to protect digital data stored on computer media.
- Completely unreadable without the proper password or the right combination of passwords.
MP4 Format
- A common multimedia container format.
- It is widely used because it is supported by most multimedia players.
- Can embed data in a variety of formats, including encoded video and audio.
Legality and Compliance Explained: Read Before Conversion
Rex
I do not provide legal advice. Laws vary by jurisdiction and context. When in doubt, consult a qualified attorney.
In the United States, Section 1201 of the US Copyright Act generally prohibits circumventing technological measures that control access to copyrighted works.
Generally speaking, it's acceptable if you make personal copies for offline viewing. But every user should never re-publish, share, or sell the downloads from FANZA, which is a clear violation of the law.
Before downloading or converting FANZA dcv. or wsdcf. files into MP4 video files, you should at least make sure that you have legal access to the videos. Buy or rent titles you like from the official site of FANZA.
Note: Although FANZA provides English service, it states its services are for Japan. That implies region controls and associated policy limits. Attempting to bypass region gates can also implicate platform terms, separate from copyright law.
3 Methods People Actually Use to Convert FANZA DCV to MP4 Files
Normally, there are 3 safe and quick methods people actually use on interest forums: Official app (DMM Player), dedicated video downloader (KeepStreams), and a professional screen recorder (OBS Studio).
| Method/Feature | Official Download | Video Downloader/Recorder | Browser Extension |
| Video Quality | Original Quality up to 4K | Original Quality up to 4K | 720p to 1080p |
| Speed (Save a movie) | In 7 minutes | In 10 minutes | In 30 minutes |
| Stability | High | Medium | Low |
| Ease of Use | Need to install DMM Player | Need to install the downloader | Best |
| Time Limit | Within your subscription | No limit | No limit |
| Output Format | dcv, wsdcf | mp4/mkv | mp4/mkv |
| Supported OS | Windows | Win/Mac | Chrome/Firefox |
*Your purchased titles on FANZA might expire too. Access is controlled by the platform and your license conditions. Playback can depend on app versions, online checks, and region policies—not a permanent MP4 download. (See platform docs for current terms.)
How to choose the most suitable method for your needs? Check my advice:
Use Official Download: If you just want offline viewing in a short time and don't care about the expiration.
Use Downloader: If you want a collection that never expires and don't want to rely on DMM Player.
Use Recorder: If you just want to save a clip of less than 10 minutes.
Verified Tools: Download FANZA Videos into MP4 Video Files
It's not impossible to download FANZA videos into MP4 video files if you choose the right tool. The following 3 tools are all verified by me and boast different pros and cons. Find the suitable tool and download FANZA videos into MP4 files, and enjoy these benefits:
- Wider Compatibility: MP4 is a widely supported format, allowing you to play your videos on almost any device or media player.
- Improved Playback Experience: MP4 often provides smoother playback and fewer technical issues compared to DCV, which can be prone to glitches or compatibility problems.
- Enhanced Portability: MP4 files are smaller and more portable, making them ideal for sharing or transferring between devices.
- Future-Proofing: By converting to a more common format, you ensure your videos will remain accessible even as technology evolves.
Tool 1: KeepStreams for FANZA
KeepStream for FANZA works on both Windows and Mac. When I tried it, this tool has an excellent ability to convert and save Fanza videos with ".dcv" and ".wmv" extensions to MP4/MKV format by default. Compared to other similar FANZA downloaders, KeepStreams gets the biggest advantage: the ability to save videos in the highest quality Full HD 1080p and 4K quality.
In addition, it has an easy-to-use user interface that is designed to be simple to operate, even for beginners. The intuitive operation method makes it easy for anyone to use.
With the 3 free trials, you can fully test its functions. Here are the detailed steps to convert Fanza videos from DCV to MP4 with KeepStreams:
STEP 1 Download and install KeepStreams for Fanza
First of all, please download Fanza Converter software from KeepStreams official site or click the button below to download Fanza Converter software according to your device model.
STEP 2 Launch KeepStreams and set the output format for your FANZA video
After installing KeepStreams, launch it and click "≡" in the upper right corner to set the output format (default is MP4 format) from Settings > Preferences > General Services > Preferred Settings > Video Format.
STEP 3 Go to FANZA in the built-in browser and login
Select "Adult Services" > "FANZA" on the left side, and when the FANZA top page appears, open the menu on the right side of the screen and select "Login" to log in to your DMM account. Enter your e-mail address, ID, password, etc. as appropriate to log in.
STEP 4 Select the video you wish to download
Once you have logged in, purchase the video content you wish to download, or select the movie you wish to download from the content you have already purchased.
STEP 5 Set the video output quality
You will then automatically be presented with a screen that allows you to select the video quality you wish to download, and you can freely select the quality of the video you wish to download. Click on "Download Now" to start the process.
STEP 6 Find the downloaded videos in MP4 format
After downloading, open the filter and the FANZA video will be saved in ".mp4" format. You can also directly open the local folder by clicking the folder icon beside the downloaded titles in the "Downloaded" section.
In this way, you've successfully removed the DRM protection from FANZA videos. Now enjoy your favorite FANZA titles offline on any device you like, any time!
Tool 2: Y2Mate FANZA Downloader
Similar to KeepStreams for FANZA, Y2Mate is also a professional tool that aims to download FANZA titles in MP4/MKV format. It boasts the ability to save DRM-protected content from FANZA and convert it into compatible MP4 files, so that you can directly play the downloads on any player you like.
Let's look at the basic features of Y2Mate. The downloader is able to save Full HD 1080p videos into MP4 from FANZA. Based on my usage, it can not only download FANZA purchases but also rentals, and regular streaming content from your subscribed channels.
Y2Mate also provides a free trial to help you download 3 full videos from FANZA in a month, which performs better than many other video downloaders in the market (those only let you save the first 5 minutes of a FANZA film).
Note: From the subscription plans, Y2Mate charges more than KeepStreams. But it performs better in download stability. You can choose the most suitable one to meet your own download requirements.
Similar to KeepStreams, Y2Mate has a built-in browser. Therefore, you can download a FANZA title through the following steps:
- Install and launch Y2Mate. Find FANZA in the "Adult Services" section.
- Log in to your FANZA account in the built-in browser.
- Play the video and Y2Mate will analyze it automatically.
- Set the download options in a pop-up window.
Tool 3: Video DownloadHelper
The last tool I'm gonna introduce is a browser extension named Video DownloadHelper. This free tool works well on both Chrome and Firefox. It's super easy to use, and it also boasts various advanced features.
For example, Video DownloadHelper is able to download high-quality videos up to Full HD 1080p from 50+ video-sharing platforms. Supported by high tech, it also performs well regarding download speed and output format (MP4).
Many users like to use Video DownloadHelper to save videos from X, Facebook, Ins, etc. Now I'll show you how this tool performs when downloading FANZA videos.
Now follow these steps to use the video downloader:
- Find and install the extension from Chrome Web Store or Firefox ADD-ONS;
- Navigate to FANZA and login to your account to get access to the videos here;
- Play the video you want to save and click the Video DownloadHelper icon at the top right;
- In the list of detected videos, choose the one you'd like to download and begin to save it.
However, when I actually use the extension to download FANZA videos, I find it's impossible because of the web version of DMM Player! When you directly play the FANZA video with your web browser, a mini DMM Player will pop up and there is no extension allowed in the tab.
Therefore, it's impossible to download FANZA videos using such a free extension, let alone online free video downloaders. Maybe a professional FANZA downloader is what you really need to convert FANZA DCV to MP4 format.
FAQs
Q1. Is FANZA free to watch?
A1. No. To watch videos on FANZA, you must subscribe to a certain channel or buy/rent a title through FANZA points. For FANZA e-books, you can enjoy a 15-day free trial, but it still requires a subscription.
Q2. Can I use FANZA outside Japan?
A2. Although FANZA provides English, the launcher/app itself may be region-restricted. FANZA’s help explicitly says it’s a Japan-only site. In the US, you can log in to your FANZA account, but playback or download says "not available in your region." To successfully watch content here, you need to change your IP address to Japan.
Q3. Why do browser extensions find no media on FANZA?
A3. That’s often by design: EME + CDM means the decrypted stream isn’t exposed to extensions. Troubleshooting won’t change platform DRM. You need to change your tool to a professional downloader or recorder.
Q4. Why do I catch a black screen when recording FANZA videos?
A4. Videos on FANZA are protected by DRM. It can make your screen become a sandstorm or turn black when you try to record videos directly. When this happens, disable graphics overlays, set your player/app to use a consistent renderer, and avoid window capture when a platform forces hardware overlays. Test with a short clip first.
Q5. What’s the difference between DCV and WSDCF?
A5. WSDCF and DCV are both specific video formats on FANZA. WSDCF is common for VR titles. DCV is broader. Both are DRM-gated and don’t remux cleanly to MP4.
Q6. Will my purchased titles on FANZA expire or lose access?
A6. Access is platform-controlled and can depend on app versions, region checks, and license rules. Just remember, owning a FANZA title ≠ a permanent MP4.
Conclusion
To sum up, DCV files downloaded from FANZA are only compatible with the DMM player. If your subscription ends, or the video expires, it will be detected by the DMM player, and the downloaded DCV videos can not be played anymore.
That's the reason why we need an MP4 video file. In this post, I introduce 3 common methods and 3 verified tools to help you convert FANZA DCV to MP4 format. Hope you can get inspired and improve your FANZA offline viewing soon.
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